# e4.1TextProgress Bar.py
import time

scale = 20
print("------执行开始------")
for i in range(scale + 1):
    a, b = '**' * i, '..' * (scale - i)
    c = (i / scale) * 100
    print("%{:^3.0f}[{}->{}]".format(c, a, b))
    time.sleep(0.1)
print("------执行结束------")
